The offer — good through May 4 — will pay up to $300 in Sprint credit for the switching customer’s current phone and a prepaid debit card worth up to $350 to cover fees triggered by leaving the other carrier.

Sprint has stepped up its marketing push with credits for customers who switch carriers to sign up for its Framily service plan.

The offer — good through May 4 — will pay up to $300 in Sprint credit for the switching customer’s current phone and a prepaid debit card worth up to $350 to cover fees triggered by leaving the other carrier.

Rival wireless carrier AT&T started courting customers of T-Mobile US with similar switching credits ahead of T-Mobile’s plan to do likewise.

Customers who sign two-year service contracts often face early termination fees if they leave before the pact is completed. Switching credits are designed to spur them to shop for a new carrier anyway.

In Sprint’s case, the switching promotion follows the launch of a marketing campaign based on its friends and family plan, called Framily. The ads focus on an odd collection of characters called the Frobinsons, led by a talking hamster as the dad.